Missing value imputation in longitudinal measures of alcohol consumption
Data(s) |
2011
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Resumo |
Attrition in longitudinal studies can lead to biased results. The study is motivated by the unexpected observation that alcohol consumption decreased despite increased availability, which may be due to sample attrition of heavy drinkers. Several imputation methods have been proposed, but rarely compared in longitudinal studies of alcohol consumption. The imputation of consumption level measurements is computationally particularly challenging due to alcohol consumption being a semi-continuous variable (dichotomous drinking status and continuous volume among drinkers), and the non-normality of data in the continuous part. Data come from a longitudinal study in Denmark with four waves (2003-2006) and 1771 individuals at baseline. Five techniques for missing data are compared: Last value carried forward (LVCF) was used as a single, and Hotdeck, Heckman modelling, multivariate imputation by chained equations (MICE), and a Bayesian approach as multiple imputation methods. Predictive mean matching was used to account for non-normality, where instead of imputing regression estimates, "real" observed values from similar cases are imputed. Methods were also compared by means of a simulated dataset. The simulation showed that the Bayesian approach yielded the most unbiased estimates for imputation. The finding of no increase in consumption levels despite a higher availability remained unaltered. Copyright (C) 2011 John Wiley & Sons, Ltd. |
Identificador |
https://serval.unil.ch/notice/serval:BIB_2CFB6A0749D5 info:pmid:21556290 https://serval.unil.ch/resource/serval:BIB_2CFB6A0749D5.P002/REF http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_2CFB6A0749D59 urn:nbn:ch:serval-BIB_2CFB6A0749D59 |
Idioma(s) |
eng |
Fonte |
International Journal of Methods in Psychiatric Research20150-61 |
Palavras-Chave | #panel surveys; missing data; multiple imputation; Bayesian models; alcohol consumption; MULTIPLE IMPUTATION; HOT-DECK; SPECIFICATION; STABILITY; ATTRITION; SELECTION; DISCRETE; DRINKING; OUTCOMES; MODEL |
Tipo |
info:eu-repo/semantics/article article |
Formato |
application/pdf |
Direitos |
info:eu-repo/semantics/openAccess Copying allowed only for non-profit organizations https://serval.unil.ch/disclaimer |